Once America's capitalist dream town, Detroit is our country's greatest urban failure, having fallen the longest and the farthest. But the city's worst crisis yet (and that's saying something) has managed to do the unthinkable: turn the end of days into a laboratory for the future. Urban planners, land speculators, neopastoral agriculturalists, and utopian environmentalists all have been drawn to Detroit's baroquely decaying, nothing-left-to-lose...